linux-kernel - Re: [PATCH v5 01/17] perf: Add SNOOP

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Date:   Thu, 21 Jul 2022 08:27:19 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        German Gomez <german.gomez@....com>,
        Ali Saidi <alisaidi@...zon.com>, Joe Mario <jmario@...hat.com>,
        Adam Li <adam.li@...erecomputing.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Kajol Jain <kjain@...ux.ibm.com>
Subject: Re: [PATCH v5 01/17] perf: Add SNOOP_PEER flag to perf mem data
 struct

On Wed, Jul 20, 2022 at 03:46:49PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jul 20, 2022 at 03:45:51PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Sat, Jun 04, 2022 at 12:28:04PM +0800, Leo Yan escreveu:
> > > From: Ali Saidi <alisaidi@...zon.com>
> > > 
> > > Add a flag to the perf mem data struct to signal that a request caused a
> > > cache-to-cache transfer of a line from a peer of the requestor and
> > > wasn't sourced from a lower cache level.  The line being moved from one
> > > peer cache to another has latency and performance implications. On Arm64
> > > Neoverse systems the data source can indicate a cache-to-cache transfer
> > > but not if the line is dirty or clean, so instead of overloading HITM
> > > define a new flag that indicates this type of transfer.
> > > 
> > > Signed-off-by: Ali Saidi <alisaidi@...zon.com>
> > > Reviewed-by: Leo Yan <leo.yan@...aro.org>
> > > Reviewed-by: Kajol Jain<kjain@...ux.ibm.com>
> > 
> > Hey, any knews about this going upstream? PeterZ?
> 
> Just took a look and it isn't in tip/master.

Yeah, this patch is not picked by maintainers.

I confirmed that this patch can be applied cleanly on tip/master
branch.  Peter.Z, could you pick this patch?

Thanks,
Leo